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Pentium D processors are pretty power hungry, so factor that into your thoughts. Also make sure you put a modern OS on it that is getting security updates. It probably has Win XP or Vista installed which isn’t safe to connect to any network.
It should work fine as a router as long as you don’t enable any of the packet inspection features. For basic routing and firewalling for a home network it should be plenty powerful. I would personally put a small SATA SSD in it as the main drive and ditch the 90GB HDD.
As an additional idea, if you put a larger SATA drive or two into it you could make it a NAS.
Crazy taxi seems like it would be best to remain a mid-budget single player game sold for a mid-budget price. Who wants this as an MMO? How can it possibly retain people for long enough to justify such an expense?